(no commit message)

diff --git a/docs/user/laptoptipsandtricks/index.mdwn b/docs/user/laptoptipsandtricks/index.mdwn
index 04c5baa..84e21fe 100644 (file)
--- a/docs/user/laptoptipsandtricks/index.mdwn
+++ b/docs/user/laptoptipsandtricks/index.mdwn
@@ -33,3 +33,12 @@ And use vidcontrol:
      274 (0x112) 0x0000000f G 1024x600x32 1   8x16  0xa0000 64k 64k 0xd0000000 7872k
 
     % vidcontrol MODE_273
+
+
+# CPU
+
+Allow cpu entering energy-saving state:
+
+    hw.acpi.cpu.cx_lowest=C3
+
+Use est/powernow to control cpu frequency.